package com.lzx;

import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicReference;

public class SpinLockDemo {

    //原子引用线程
    AtomicReference<Thread> atomicReference = new AtomicReference<>();

    public void mylock(){
        Thread thread = Thread.currentThread();
        System.out.println(thread.getName() + "\t come in");
        while (!atomicReference.compareAndSet(null, thread)) {

        }
    }
    public void myUnlock(){
        Thread thread = Thread.currentThread();
        atomicReference.compareAndSet(thread, null);
        System.out.println(Thread.currentThread().getName() + "\t invoked myUnlock()");
    }

    public static void main(String[] args) {
        SpinLockDemo spinLockDemo = new SpinLockDemo();
        new Thread(()->{
            spinLockDemo.mylock();
             try{TimeUnit.SECONDS.sleep(5);}catch(InterruptedException e){ e.printStackTrace();}
             spinLockDemo.myUnlock();
        },"AA").start();

         try{TimeUnit.SECONDS.sleep(1);}catch(InterruptedException e){ e.printStackTrace();}

         new Thread(()->{
             spinLockDemo.mylock();
             try{TimeUnit.SECONDS.sleep(1);}catch(InterruptedException e){ e.printStackTrace();}
             spinLockDemo.myUnlock();
         },"BB").start();
    }

}
